Electrochemical formation of graphite oxide from the mixture composed of sulfuric and nitric acids

Gurzęda, Bartosz; Krawczyk, Piotr

doi:10.1016/j.electacta.2019.04.088

Cited by 26 publications

(14 citation statements)

References 46 publications

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“…26 However, the mismatch of the observed GQDs peak could attribute to disordered structures on the edge of GQDs. 27–30 Moreover, the peak is not observed for the non-GQDs sample (pure ZnO). Therefore, it is believed that the existence of GQDs-related peak may imply to the formation of GQDs–ZnO nanocomposites.…”

Section: Resultsmentioning

confidence: 96%

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Phophayu

Pimpang

Wongrerkdee

et al. 2019

Journal of Reinforced Plastics and Composites

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The high crystallinity of graphene quantum dots-ZnO nanocomposites is considered to have a significant effect in improving the carrier lifetime for enhanced photocatalytic degradation. The graphene quantum dots-ZnO nanocomposites were synthesized by adding graphene quantum dots solution into starting precursors during the precipitation. Characterization was performed using various techniques. High crystallinity of graphene quantum dots-ZnO nanocomposites is obtained in terms of increased crystal size and decreased dislocation density. The improved crystallinity increases the carrier lifetime on the material surface for the functional improvement of photocatalytic material. Photocatalytic test of methylene blue and methyl orange was performed under UV irradiation. Degradation rate constant reaches the maximum value for both organic dyes for the appropriate preparing condition of graphene quantum dots-ZnO nanocomposites. The graphene quantum dots-ZnO nanocomposites were then applied to degrade commercial glyphosate herbicide contaminants for an agricultural wastewater treatment investigation. The investigation aims to demonstrate a facile useful way of herbicide contaminant reduction for the better health of farmers. The graphene quantum dots-ZnO nanocomposites show an enhancement of the photocatalytic process with improved degradation rate constant (23% increased) in comparison to pure ZnO. Therefore, this work demonstrates that graphene quantum dots-ZnO nanocomposites can be used as a photocatalytic material for degrading organic dyes and commercial herbicide contaminants owing to its low-cost and environmental-friendly properties.

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Section: Resultsmentioning

confidence: 96%

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Phophayu

Pimpang

Wongrerkdee

et al. 2019

Journal of Reinforced Plastics and Composites

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“…When the electrolyte concentration was increased to 3 M, this proportion increased to 50.76% with increasing amounts of CO and O–CO groups, indicating a higher oxidation level . Gurzeda et al also reported that the use of 95% H 2 SO 4 /65% HNO 3 (3:1) with the addition of 26 wt % water could result in a high C/O ratio of 2.09 and a mass increase of 74.5% for the as-synthesized GO …”

Section: One-pot Electrochemical Reaction For Go Productionmentioning

confidence: 94%

“…65 Gurzeda et al also reported that the use of 95% H 2 SO 4 /65% HNO 3 (3:1) with the addition of 26 wt % water could result in a high C/O ratio of 2.09 and a mass increase of 74.5% for the as-synthesized GO. 66 Perchloric acid (HClO 4 ) was also reported as the electrolyte for electrochemical synthesis of GO. 32,37,49,67 Krawczyk and co-workers demonstrated that stage-II HClO 4 -GICs were formed in 8 M HClO 4 solution, and afterward oxidation of the graphite anode took place.…”

Section: ■ Introductionmentioning

confidence: 99%

Recent Advances in Green, Safe, and Fast Production of Graphene Oxide via Electrochemical Approaches

Fang

Lin

2019

ACS Sustainable Chem. Eng.

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There has been extensive interest in developing a highly efficient production route toward graphene oxide (GO). Although the conventional chemical oxidation is widely used to synthesize GO, it suffers from some intrinsic issues such as long reaction time, explosion risk, and environmental pollution. Recent explorations of the electrochemical approaches have led to a breakthrough for GO synthesis, namely, the green and safe mass production of high-quality GO within hours. In this article, the principles of electrochemical synthesis of GO are revealed, and the recent advances are summarized in terms of the one-pot reaction and the two-step process with a focus on the quality and quantity of products. Moreover, the challenges and future research directions associated with the electrochemical production of high-quality GO are outlined.

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“…Oxidizing acids were intercalated between the layers of graphite based on a previously described methodology 36,37 . In this procedure, a solution containing 10 g GF, 120 ml of H 2 SO 4 and 30 ml of HNO 3 (fraction of 4:1 v/v) was maintained in magnetic stirring for 24 h at room temperature 38,39 . Then, this solution was filtered with the aid of a vacuum pump, 40 generating a gray‐black material, which is here entitled as graphite intercalated compound (GIC).…”

Section: Methodsmentioning

confidence: 99%

“…36,37 In this procedure, a solution containing 10 g GF, 120 ml of H 2 SO 4 and 30 ml of HNO 3 (fraction of 4:1 v/v) was maintained in magnetic stirring for 24 h at room temperature. 38,39 Then, this solution was filtered with the aid of a vacuum pump, 40 generating a gray-black material, which is here entitled as graphite intercalated compound (GIC). Finally, the GIC was washed with deionized water in a Büchner funnel until reaching neutral pH (~7) and dried in an oven at 100 C for 3 h to remove physical adsorbed water.…”

Section: Graphite Intercalationmentioning

confidence: 99%

Development of xanthan gum‐based solid polymer electrolytes with addition of expanded graphite nanosheets

Knuth

knuth

Maron

et al. 2022

J of Applied Polymer Sci

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A composite based on natural polymer xanthan gum (XG) and expanded graphite nanosheets (GNs) was prepared for application as a flexible and ecofriendly solid polymer electrolyte (SPE). To evaluate the ionic conductivity, electrochemical impedance spectroscopy was performed at different temperatures, ranging from 25 to 80 C, reaching high values of 1.1 Â 10 À3 and 2.43 Â 10 À3 S cm À1 at room temperature and 40 C, respectively, for the sample containing 0.5% by weight of GNs. Additional characterizations including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and cyclic voltammetry were implemented to get full structural, morphological and optical relevant features of these samples. The results showed that flexible SPEs based on XG/GNs are very promising and can be used as electrolytes with high potential of application in a wide variety of electrochemical devices.

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Electrochemical formation of graphite oxide from the mixture composed of sulfuric and nitric acids

Cited by 26 publications

References 46 publications

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

Recent Advances in Green, Safe, and Fast Production of Graphene Oxide via Electrochemical Approaches

Development of xanthan gum‐based solid polymer electrolytes with addition of expanded graphite nanosheets

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